Riveting tool



E. M. BETTINGTON RIVETING TOOL Sept. 11, 1945.

Filed Nov. 10, 1943 WA ///W 7 am m- 5 ufml Patented Sept. 11, 1945 2,384,434 RIVETING TOOL Egerton Mitford Bettington, Welwyn Garden City, England, assignor to Aviation Developments Limited, London, England, a British company Application November 10, 1943, Serial No. 509,791 In Great Britain April 28, 1939 1 Claim.

This invention relates to that kind of tool for upsetting tubular rivets which includes a mandrel inserted through the rivet and adapted to be drawn completely through the rivet during the upsetting operation. The invention is a continnation in part of that described in my application Serial Number 331,057, filed April 22, 1940, now Patent 2,336,058, granted December 7, 1943.

The primary object of the present invention is to provide an improved tool of this class in which the mandrel may be introduced laterally instead of axially as has hitherto been the case.

Tools of the general class to which my invention relates are well known in the art and operate on the principle of radially enlarging a tubular rivet by drawing through the rivet a mandrel having an enlargement on its end, the diameter of which enlargement is greater than the internal diameter of the rivet. In the use of such tools a tubular rivet is first threaded onto the stem of the mandrel, after which the end of the stem opposite that on which the enlargement is formed is inserted between the jaws of a tool employed to grip the stem of the mandrel and to pull the mandrel through the rivet.

In the accompanying drawing two embodiments of my present invention are shown by way of example. In the drawing- Figure l is an axial section through the first embodiment;

Figures 2 and 3 are sections on the lines Iii-11 and III-III in Figure 1 respectively; and

Figure 4 is a cross-section through the second embodiment.

The tool shown in Figures 1 'to 3 comprises a cylindrical member I to which a nose-piece 21 is rigidly secured, these two parts together constituting the outer casing. The nose-piece 2| is formed with a cylindrical bore in which an internally tapered sleeve 2 slides. This sleeve is united by a screw-thread to a slotted sleeve '3 which receives an operating cam 4 and in which is mounted a roller 5 against which the cam bears. A spring 6 bears on the free end of the sleeve 3 and also on an abutment sleeve in the tail end of the part I of the casing. When the cam 4 is turned, the sleeve 3 is moved backwards against the action of the spring 6 and. carries the sleeve 2 with it. Within the sleeve 2 there is an externally tapered jaw carrier 8 formed with a diametrical slot that serves as a housing for two jaws 9. The end of the sleeve 2 is closed by a plug Ill and a compression spring H bears at one end on this plug and at the other end on the carrier 8 so that the latter is always urged towards the narrow end of the sleeve 2. In operation the stem of a mandrel 12 having an enlarged head l3 and carrying a tubular rivet I4 is engaged by the jaws 9. As the carrier 8 is urged towards the narrow end of the sleeve the jaws are urged into gripping contact with the mandrel and thus when the whole sleeve 2 is moved downwards, as shown in Figure 1, the jaws pull the mandrel downwards. The end of the nose-part 2| serves as an abutment for the rivet and prevents the rivet from moving with the mandrel so the head of the mandrel is pulled through the rivet and spreads the tail of the rivet. During the return stroke the carrier 8 engages the inner end wall of the nosepart 2| while the sleeve 2 is still travelling upwards so that the sleeve on moving further allows the jaws to move radially to release the mandrel. The mandrel is then removed, furnished with a fresh rivet, and replaced.

Hitherto the removal and replacement of the mandrel have been effected by introducing the stem of the mandrel axially into the tool. This is not always convenient, and in my present invention I provide means for introducing the mandrel radially into the tool. For this purpose I provide a slot H: in the nose-part 2|, another slot IS in the sleeve 2, and yet a third slot 11 in the carrier 8, and I ensure that these slots are maintained in register with one another and with a gap between the two jaws during the relative axial movements that take place during operation. This maintenance of the registration of the slots is effected by a cross-pin l8 which is carried by the sleeve and passes through a diametrical slot IS in the carrier 8 and extends into an axial slot 20 in the nose-piece 2 I. Thus there are pin-andslot connections between the sleeve and the carrier and the sleeve and the casing respectively. 7 It will be understood that the jaws 9 cannot in any case turn relatively to the carrier 8 since they are held in the slot formed in that carrier to house them.

It will readily be seen that the stem of the mandrel can pass through the registering slots into positions between the jaws when it is to be inserted in the tool.

In the tool shown in Figures 1 to 3 the relatively sliding parts are all cylindrical. They can, however, be made rectangular in cross-section and then of course they they are unable to turn axnally relatively to one another so that it becomes unnecessary to provide the pin l8 or its equivalent. A cross-section through the nose end of a tail having its parts thus rectangular in section is shown in Figure 4 and it will readily be seen that the nose-part 2i, sleeve 2' and jaw carrier 8', being all rectangular, are prevented from relative rotation. As in the tool of Figures 1 to 3, the laws 9' being housed in a slot in the carrier 8 are prevented by the walls of that slot from turning axially relatively to the carrier.

What I claim is:

In a tool for gripping and pulling a mandrel for upsetting tubular rivets, a tubular casing formed with an axial slot in its wall, an internally 10 tapered sleeve slidable within said casing and formed with an axial slot in register with the first axial slot, a. jaw carrier slidable within the sleeve, at least two externally tapered jaws housed in the carrier and in one position of the sleeve 15 ally through the registering slots and opening.

EGER'I'ON MITFORD BE'I'I'INGTON. 

